When Does Pumpkin Spice Season Start at Starbucks and Dunkin?When Does Pumpkin Spice Season Start at Starbucks and Dunkin?When will Starbucks, Dunkin' Donuts, and Krispy Kreme kick off PSL season? We've got the rundown on when these restaurants start to serve pumpkin spice treats.Meg DowdyMeg Dowdy